diff --git a/src/Routing/Responder.php b/src/Routing/Responder.php
new file mode 100644
index 0000000..5ae9d3d
--- /dev/null
+++ b/src/Routing/Responder.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace WellRESTed\Routing;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamableInterface;
+
+class Responder
+{
+    public function respond(ResponseInterface $response, $chunkSize = 0)
+    {
+        // Status Line
+        header($this->getStatusLine($response));
+        // Headers
+        foreach ($response->getHeaders() as $key => $headers) {
+            $replace = true;
+            foreach ($headers as $header) {
+                header("$key: $header", $replace);
+                $replace = false;
+            }
+        }
+        // Body
+        $body = $response->getBody();
+        if ($body->isReadable()) {
+            $this->outputBody($response->getBody(), $chunkSize);
+        }
+    }
+
+    private function getStatusLine(ResponseInterface $response)
+    {
+        $protocol = $response->getProtocolVersion();
+        $statusCode = $response->getStatusCode();
+        $reasonPhrase = $response->getReasonPhrase();
+        if ($reasonPhrase) {
+            return "HTTP/$protocol $statusCode $reasonPhrase";
+        } else {
+            return "HTTP/$protocol $statusCode";
+        }
+    }
+
+    private function outputBody(StreamableInterface $body, $chunkSize)
+    {
+        if ($chunkSize > 0) {
+            $body->rewind();
+            while (!$body->eof()) {
+                print $body->read($chunkSize);
+            }
+        } else {
+            print (string) $body;
+        }
+    }
+}
diff --git a/test/src/HeaderStack.php b/test/src/HeaderStack.php
new file mode 100644
index 0000000..c82e714
--- /dev/null
+++ b/test/src/HeaderStack.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace WellRESTed\Routing;
+
+class HeaderStack
+{
+    private static $headers;
+
+    public static function reset()
+    {
+        self::$headers = [];
+    }
+
+    public static function push($header)
+    {
+        self::$headers[] = $header;
+    }
+
+    public static function getHeaders()
+    {
+        return self::$headers;
+    }
+}
+
+function header($string, $dummy = true)
+{
+    HeaderStack::push($string);
+}
diff --git a/test/tests/unit/Routing/ResponderTest.php b/test/tests/unit/Routing/ResponderTest.php
new file mode 100644
index 0000000..be948f3
--- /dev/null
+++ b/test/tests/unit/Routing/ResponderTest.php
@@ -0,0 +1,121 @@
+<?php
+
+namespace WellRESTed\Test\Unit\Routing;
+
+use Prophecy\Argument;
+use WellRESTed\Routing\HeaderStack;
+use WellRESTed\Routing\Responder;
+
+require_once(__DIR__ . "/../../../src/HeaderStack.php");
+
+/**
+ * @covers WellRESTed\Routing\Responder
+ */
+class ResponderTest extends \PHPUnit_Framework_TestCase
+{
+    private $response;
+    private $body;
+
+    public function setUp()
+    {
+        HeaderStack::reset();
+        $this->body = $this->prophesize('\Psr\Http\Message\StreamableInterface');
+        $this->body->isReadable()->willReturn(false);
+        $this->response = $this->prophesize('\Psr\Http\Message\ResponseInterface');
+        $this->response->getHeaders()->willReturn([]);
+        $this->response->getProtocolVersion()->willReturn("1.1");
+        $this->response->getStatusCode()->willReturn("200");
+        $this->response->getReasonPhrase()->willReturn("Ok");
+        $this->response->getBody()->willReturn($this->body->reveal());
+    }
+
+    public function testSendStatusCodeWithReasonPhrase()
+    {
+        $this->response->getStatusCode()->willReturn("200");
+        $this->response->getReasonPhrase()->willReturn("Ok");
+
+        $responder = new Responder();
+        $responder->respond($this->response->reveal());
+        $this->assertContains("HTTP/1.1 200 Ok", HeaderStack::getHeaders());
+    }
+
+    public function testSendStatusCodeWithoutReasonPhrase()
+    {
+        $this->response->getStatusCode()->willReturn("999");
+        $this->response->getReasonPhrase()->willReturn(null);
+
+        $responder = new Responder();
+        $responder->respond($this->response->reveal());
+        $this->assertContains("HTTP/1.1 999", HeaderStack::getHeaders());
+    }
+
+    /**
+     * @dataProvider headerProvider
+     */
+    public function testSendsHeaders($header)
+    {
+        $this->response->getHeaders()->willReturn([
+            "Content-length" => ["2048"],
+            "X-foo" => ["bar", "baz"],
+        ]);
+
+        $responder = new Responder();
+        $responder->respond($this->response->reveal());
+        $this->assertContains($header, HeaderStack::getHeaders());
+    }
+
+    public function headerProvider()
+    {
+        return [
+            ["Content-length: 2048"],
+            ["X-foo: bar"],
+            ["X-foo: baz"]
+        ];
+    }
+
+    public function testOutputsBody()
+    {
+        $content = "Hello, world!";
+
+        $this->body->isReadable()->willReturn(true);
+        $this->body->__toString()->willReturn($content);
+
+        $responder = new Responder();
+
+        ob_start();
+        $responder->respond($this->response->reveal());
+        $captured = ob_get_contents();
+        ob_end_clean();
+
+        $this->assertEquals($content, $captured);
+    }
+
+    public function testOutputsBodyInChunks()
+    {
+        $content = "Hello, world!";
+        $chunkSize = 3;
+        $position = 0;
+
+        $this->body->isReadable()->willReturn(true);
+        $this->body->rewind()->willReturn(true);
+        $this->body->eof()->willReturn(false);
+        $this->body->read(Argument::any())->will(function ($args) use ($content, &$position) {
+            $chunkSize = $args[0];
+            $chunk = substr($content, $position, $chunkSize);
+            $position += $chunkSize;
+            if ($position >= strlen($content)) {
+                $this->eof()->willReturn(true);
+            }
+            return $chunk;
+        });
+
+        $responder = new Responder();
+
+        ob_start();
+        $responder->respond($this->response->reveal(), $chunkSize);
+        $captured = ob_get_contents();
+        ob_end_clean();
+
+        $this->assertEquals($content, $captured);
+    }
+}